作战空间协同感知及资源冲突消解研究

在作战行动中,探测任务需要由不同的探测资源配合使用才能完成,论文研究了协同感知以及复杂任务的分配问题,如果需要在同一时刻调度同一资源,就要通过资源调度或者协商来消解这种冲突,论文对冲突消解的方法进行了研究.     

合作学习在高职英语语法教学中的应用

英语语法课应以训练学生使用语言知识点进行口头表达和笔头表达为目的。本文以建构主义理念下的合作学习为背景,运用课堂观察法阐述了英语语法课上的口头和笔头实践活动,分析了存在的问题及对策,探索了合作学习在英语语法教学中的可行性。     

交叉口动态车道与交通信号协同优化方法

以往动态车道研究倾向于在固定信号配时或预先设定的信号配时方案下进行优化，无法充分利用交叉口的时空资源.本文根据实时交通需求，以交叉口车辆平均延误最小为目标，以信号周期、相位绿灯时间和车道数为约束条件，构建动态车道与交通信号协同优化模型.模型分两部分，第1部分考虑进出口道车道平衡，计算可行的动态车道备选方案，将备选方案的输出参数作为第2部分模型的输入参数；第2部分根据实时交通需求，生成动态车道优化方案和信号优化方案.将本文优化方法与传统信号配时方法进行比较，实验结果表明，本文模型能更好地降低交叉口平均延误，有效提升信号交叉口时空资源利用率.     

Risk assessment of inland waterborne transportation using data mining

ABSTRACT

China has constructed a relatively complete inland waterborne transportation system. However, the frequent occurrence of inland water accidents with serious consequences, like the catastrophic Orient Star shipwreck, is an urgent unsolved problem. To reduce such accidents in the future and improve inland waterborne transportation safety, this study uses data mining, mainly containing text mining and association rule mining to risk assess China’s inland waterborne transportation, rather than the traditional quantitative risk assessment model. Text mining enables the risk factors to be objectively identified and distilled from accident reports. The potential relationships between risk variables are explored using association rule mining, based on the FP-Growth algorithm. The results reveal the essential problem facing China’s inland waterborne transportation system: frequent and varied ship accidents; key risk factors include overloading or improper loading, poor navigation visibility, inadequate sailor competence, and insufficient government supervision of shipowners and shipping companies. Combining the actual circumstances of inland waterborne transportation operations, this study proposes relevant recommendations for governments and relevant supervisory departments. The integrated application of text mining and association rule mining serves to avoid uncertainty and subjectivity, and achieve good results proving their scientific nature as a feasible method in water transportation risk research.     

Cooperative path following control of UAV and USV cluster for maritime search and rescue北大核心CSCD

［Objectives ］ This paper studies a three-dimensional (3D) cooperative path-following control problem in the process of maritime search and rescue for a heterogeneous unmanned cluster system composed of unmanned aerial vehicles (UAVs) and unmanned surface vehicles (USVs).［Methods ］ First, kinematic models of the UAVs and USVs are established under a fixed coordinate system and body coordinate system. In order to design a 3D path-following controller suitable for motion control, an air coordinate system is established, and the path tracking error models of the UAVs and USVs are established in the Serret-Frenet coordinate system. Next, a 3D line-of-sight (LOS) guidance law is designed at the kinematic level, and a cooperative path-following control method suitable for heterogeneous clusters of marine vehicles is proposed, allowing the UAVs and USVs to track the preset parameterized path. Finally, the stability of the control system is analyzed based on the Lyapunov stability theory.［Results］The simulation results verify the effectiveness of the proposed cooperative path-following control method for heterogeneous clusters of marine vehicles.［Conclusions］The results of this study can provide references for maritime search and rescue by using the proposed cooperative path-following control method. © 2022 Journal of Clinical Hepatology. All rights reserved.     

长大纵坡桥面结构组合研究

长大纵坡条件下桥面铺装结构组合的耐久性问题一直是道路建设中的一项技术难题.文中对拟定的结构组合进行配合比设计,利用配合比设计结果进行路用性能试验.对不同结构组合的路用性能试验结果进行分析,确定不同结构组合的路用性能优劣.最终优选出适合长大纵坡桥面铺装的结构组合形式.     

多径环境下多终端协作高精度定位算法

为抑制非视距误差对定位精度的影响,提出了一种异构网络环境下利用移动终端间的协作信息提高定位精度的算法.该算法根据测量的TOA(time of arrival)与基于GIS定义的SF(sentinel function)之间的关系,对移动终端与基站间的传播进行非视距识别.仿真分析结果表明,在多径环境下,提出的多终端协作定位算法的定位精度比现有算法大为提高.在协作终端数为8,其中处于视距传播的终端数为5时,提出的算法将定位误差小于90 m的概率从53%提高到98%.     

基于语义记忆模型的品牌联想表征的分析

品牌联想是品牌形象塑造的重要构件,是品牌资产的重要组成部分。文章以认知心理学有关语义记忆理论与模型为支撑,探讨人脑长时记忆中品牌联想的表征问题。研究在有关概念阐述以及部分学者关于品牌联想维度的观点梳理基础上,参考实际调研结果,对品牌联想网络的节点分群、节点概念关系、节点连线、网络结构进行了描述与形象表达。     

基于 Shapely 值的公路 BT 项目利益分配研究

BT模式在我国已得到快速发展,这在很大程度上缓解政府建设资金的不足问题。然而利益分配又是项目建设中比较突出的问题,对合作关系的后续发展具有重要影响。将合作博弈中的Shapely值解法运用到公路BT 项目建设中,根据收益分配的影响因素,建立Shapely值分配模型,这一模型能够很好地解决收益分配不合理、不公平问题。     

有人机／无人机协同作战系统关键技术研究

无人机将是我国下一步要重点发展的武器装备,而无人机和有人机实施联合编队进行协同作战将是其典型作战方式之一。文章在深入阐述有人机／无人机协同作战基本概念的基础上,通过设定典型有人机／无人机协同作战想定,分析了有人机／无人机协同作战的系统基本组成和体系结构,研究了有人机／无人机协同作战的关键技术。文章的研究对有人机／无人机协同作战的发展具有一定的指导意义。